diff --git a/src/buffer.h b/src/buffer.h
index ab1c4b54..590b49c7 100644
--- a/src/buffer.h
+++ b/src/buffer.h
@@ -64,4 +64,4 @@ template <size_t N> struct Buffer {
 
 } // namespace nghttp2
 
-#endif // RINGBUF_H
+#endif // BUFFER_H